Can-filling machine



(No Model.) ev SheetsSheet "1;- W. E. NIOKERSON. CAN FILLING MACHINEaPatented Jan. 5

jazz-MM @34 W13. NI'GKBRSONL- 6 Sheets-Sheet 2.

, (No Model.)

CAN FILLING MAGHINE.

Patented Jafif5, 1897..

(No Model.) H 6 8heets-Sheet4.

' W, E. NIOKERSON. CAN FILLING MAQHIN'E.

Patented Jan. 5, 1897.

(No Model.) 6 Sheets-Sheet 5.

' W. E. NIOKERSON.

GAN FILLING MA GHINE. No. 574,444. V Patented Jan. 5,1897.

(No Model.) 4 6 SheLs-Sheet 6 W. E. NIOKERSON.

CAN FILLING MAGHINE.

No. 574,444. Patent ed Jan. 5, 1897.

\llllllll-ll Ill-Hill I WITIJEESEE I v V lpk/EPTEJR WW I @544 WWW a pingdevice.

:lTED STATE PATENT O FICE.

Wi I-AM .EMERY NICKEEtSOMOF CAMBRIDGE, \MASSACHUSE'ITS', ssienon 'ro THENEW ENGLAND wmenme MACHINE COMPANY, or (BOSTON,

MASSACHUSETTS.

FOAM-FILLING MACHINE.

SFECIFICA TIO N forming part of Letters Patent No. 574,444, datedJanuary 5, 1897.

Application filed-lprill6,1896. Serial renames.- Nomodelu It isespecially adapted to operate in connec .tion with automaticweighing-inachines, and

is hereinafter fully set forth and described. My invention isillustrated in theaccompai5 nying drawings, in which- Figure 1 is ageneral view, in front elcva tion, of a weighing-machine, and in connectlon therewith my novel apparatus, exceptinga'part consisting of acan-delivering chute or raceway, which if shown-in position in this viewvould obscure other parts, said raceway beingshown in Fig. 1? and alsoin plan in Figs.

2, 2, and 2. Fig. 1 is a side elevation of a raceway which serves todeliver empty cans :5- to a rotating table. Fig. 1" is a perspectiveview of a pair of friction driving-disks. Fig. 2 is a plan'ofa portionof my apparatus, in-

cluding a rotating table, traveling aprons,

rapping device, and can-delivering chute or raceway. -Fig. 2 is a detailexplanatory of theaetion of the dclivering'ehute or raceway. Fig. ,2 isalso a detail pertaining to the same subject-matter as Fig. 2. Fig. 3represents, partly in side elevation and partly in vertical beams and'alatch device. Fig. 3 shows, partly in side elevation and partly invertical section, a portion of Fig. 3,,bntwith a canholding beam ,in theposition which'it tends 4c'to take when holding a filled can.

shows, partly in front elevation and partly in vertical section,traveling aprons or conveyers and other parts, including a device fortightening one of the aprons and also a rap- Fig. dis a View, partly inside elevation and partly in vertical section, of the matterdisclosedinFig.4. Fig.6shows, partly in front elevation and partly in verticalsection, driving and tightening gear for the main 5o travelingapron.Fig.7shows diagrammatic- .35 section, a'rotating table havingcan-holding Fig. 4

part.

ally in plan the mode of operation-oi apart of theapparatus.Fig.8issup'plementarytoFig, 7 showing the parts in another position.v.Fig. 9 is also supplementary toFig. 7 in the same manner as Fig. 8.Fig. ld-is a view in side elevation (agreeing with Fig. 7 of a devicefor stopping the .weighingmachine if cans are not properly presented, aportion of the rotating table with can-holding beams being shown -'atthe lower part of the figure and a feeding 6o device for theweighing-machine at the upper Fig. 11 represents a part of the mechanism shown in Fig. 10in a diilercntposition-- viz., with a can missingfrom a can-holding beam-,and agrees with Fig. 9. Fig. 12 is an. enlargedview, in side elevation, of apart of the mechanism shown in Fig. 10, andespeciallyshows a clutch mechanism and clutch latch.

weighing-machine in case the jeans or other receptacles are notregularly presented, and, further, when desired, to enable multiples ofthe weightdelivered by each discharge'of the weighing-machine tobeiutroduced into each can. l I shall use, for the sake of convenience,the word can as representing any sort of package or receptacle to hefilled, including bags in so pporting-f'ra mes, boxes of wood or pasteboard, bottles,-1or jars. go

I In the drawings, M, Fig. 1, represents a weigh ingmachine adapted todischarge at intervals uniform weights of material. As the constructionof this machine is not involved in this application, and sincethemachine 5 itself is simply introduced in order to disclose a completeworking system, a detailed description of it will not be necessary.

N is afeeding device consisting principally of a hopper,independently-driven feedingzoo set-screws.

wheel, and a spent and is adaptedto deliver into the \veighing-niachinethe last portion of each charge of material in a uniform stream.

The case N contains a mechanism not concerned inthis description, whichsupplies to the weighing-machine that part of the load not furnished bythe feeding device N. r

The specific construction of the weighingmachinc H and feeding devices Xand N forms the subject-matter of previous patents and applications.

T is a rotating table, Figs. 1, :2. and 3, moitnted upon a verticalspindle T and is supported by the pedestal T The height of the table isadjusted by means of the pivotscrew i located in the base of thepedestal. Upon thc table are mounted a number of pivoled can-holdingbeams B B. These beams oscillate at b 1) upon supports attached to thetop of the table, as shown, and carry near their inner ends the weightsB 13, adapted to slide along the inner part of the beams for the purposeof adjustment and to be held at any desired point by set screws Theinner ends of the beams project slightly under the cap-piece T, whichprevents them from risingv beyond alimited distance. I The outer ends ofthe beams are bifurcated or otherwise adapt'ed to receive and hold thecans into which is to be introduced a weighed charge of material fromthe weighing-machine. The relation of the weights'to the filled andempty cans upon the beams is such thatwvhen an empty can is on the beamthe weight prepondcrates, but when the charge is introduced into the canthe weight is lifted and the can and'th'e outer end of the beam becomedepressed.

The beams B B are provided with the vertical standards B 15 which serveto support the funnels B B by means of the holders B B, said holdersbeing adjustably mounted upon the standards and secured thereto by Thetable is also provided with a series of stop-pieces L L, one for eacharm, and with a latch L, mounted upon the bracket L and adapted toengage with the stop-pieces L L in succession, thus preventing the tablefrom rotating until its disengagement, and then only allowing a movementfrom one stoppiece to the succeeding one. The beams B B are furtherprovided with the drop-pieces B B, which upon the depression of theouter ends o'fzihe beams respectively come in contact. with the latch L,forcingit down ward and disengagin9, it from the respect ive stop-piece;(see Fig. 3%) thus allowing the table to rotate until the latch comes incontact with the next stop piece in succession. The table '1 is causedto rotate in the direction of the arrow, whenever the latch L isdisengaged, by means of a pair of friction-disks, the upper one ofwhich, D, is driven by the belt D and rests upon its complementarydiskD, thelattcr being rigidly attached to its shaft. These disks .aremounted upon the vertical shaft Dfiwhich is secured at its lower end inthe cap-piece T" and at its upper end by a suitable housing. (Notshown.)

The table '1. is so placed with reference to the discharge-orifice m(see Figs. 1 and 2) of the weighing-machine that when one of thestoppicees L L is in engagement with the latch L one of the funnels B B,with its corresponding can and arm, is directly beneath said orifice,and that upon a discharge of the weighing-machine the material will fallinto the can.

Suitably located with reference to the table T is a main conveying beltor traveling apron A, adapted to transport the filled cans or packagesto such places as are required for labeling or other operations.

S is a supplementary conveying belt or apron next to and extendingfor alimited distance parallel with the main apron A. This supplementaryapron is used when morethan one weighlug-machine is to be operated inconnection with the main apron A. By the use of this supplemcntz'u'yapron witheach Weighing-machine and rotating table the cans from anumber of such machines may be conveyed upon the main apron withoutinterference with each other.

'When one weighing-n1achine only is employed, the supplementary apronmay be dispensed with and the cans received directly upon the end of themain apronin the same manner in which they are shown as entering uponthe supplementary apron.

.The rollers upon which the main apron A travels are supported by aframework A, of wood or other suitable material, supported upon the legsA and having the portion A offset, as shown, for the accommodation ofthe supplementary apron S.

The supplementary apron S is driven by the main apron A in the mannershown in Figs. 4 and 5. The under or return pait of the main apron runsover the rollers (H1 (showri causing sufficient friction upon therollerss 3, around which the supplementary apron runs, to cause them toturn, and thus drive the supplementary apron. Tension is maintained onthe supplementary apron by means of't'he tighteningrollers s s, mountedupon the frame 5 said. frame beingbalanced upon the arm The ti ghtening-rollers s s arepressed against the under side of thesupplementary apron S by means of the weight 3 and c0- operate with theroller o to take up the slack.

The main apron is driven by the mechanismdisclosed in Fig. 1 andenlarged and shown partly in section in Fig. 6.

G isadrivingalrum mounted upon the shaft 9, said shaft also carrying thegear-wheel g. The secondary shaft g is provided with the pinion gengaging with the said gear-wheel g, and also with the pulley'q and thesmall secondary roller or drum G.

H is a swinging frame pivoted at h and provided with a weight 71 Thisframe H carries the ti ghtening-roller II. The apron A by dotted lines)and under the rollers 33,

idler roller (1 574,444 n pl 3 passes around the drum G and over thesmall dll m' G, (whereby it is doubly driven',) then under thetightening-roller II and over the tion,-whcreby it exerts a strongpulling forceupon the apron'after it has passed round the drum G,causing the latter to drive thereby with great power. Thetightening-roller II serves to take up the stretch of the apron A and tomaintain an even tension thereon,

' The empty'cans are delivered to the table bymeans of the inclinedchute or raceway (See Figs. 1, 2, and 2".) The 'row of cans upontheraceway, by their tendency to slide downward, serve to force the last orlowest can of the row upon one of the beamsB B whenever such beam ispresentedempty at the foot of the raceway. The raceway is madepreferably curved at the lower end, so as to bring the lowest can into anearly upright position. If there is a can on the beam presentcd, the.downward movement of the row of cans on the raceway is checked by it,nor is there space for a can to enter between any two of the beams 13'l3,'a.nd as the table ro-. tates the ends of the beams hold back the.

cans un til an empty beam is presented, whereuponthe next and lowest canis forced into it (See Figs. 2, 2, and 2 The frameworkAfis provided witha sheararm K, which serves to move filled cans ed the beams B 13 to theapron S upon a movement of the table. This framework is also prc videdwith an inclined arm 0, Fig. 2, which serves, upon a movement of thetable, to succc-ssivel y elevate the outer ends of the beams ll 13 afterthey have been depressed by receivi ng a discharge from theweighing-machine and preparatory to movingthe filled cans off the beamsto the apron.

Housed .in a supporting-piece I (see Figs. 2, l, and 5) is .a verticalspindle r; This spindle has rigidly. attached to it a pulley r andmounted upon it and attached to a long sleeve 2' is apulley 2:", whichwith its sleeve 0' is free to turn upon the spindle.

just been filled with material, thereby shak-' ingdown' (n-settling theeharge,'in order that .it'may not bespilled 'upon the movement oftheeans oil? the beams ll ll to the apron S.

The rapping device is'full'y operative if only one of the hubs withflexible spokes is used,

The circumference of the- The small d ru m is preferably, how-- thetable.

Upon the upper end of the spindle r is'mou'nted a hub.

but two hubs withopposite motions are more,

effective; a

Sincea-dischargei of material into a can causes the depression of thecorresponding beam of thcsc-ries B ll and thereby the releasement of thelatch L; and consequent movementof thetab'le T, whereby an empty can isagain brought under the discharge-orifice m of the weighing machine, andsince if such empty canwas not 'present'edto the 'ori'-' fice the tablewould not move and the-weighing-machine would continue upon the iloor, Ihave provided a safety mechanism which, in case any armas itapproachesthe posit-ion under the weighing machinejs not provided withacan, will shut off the feeding device of the weighing machine. Thissafety device is shown in Figs. 1, 1O, 11,

illustrated in Figs. 7,, 8, and J. v s

C isa bent arm pivoted upon a supportat O and carrying upon its lowerend the curved piece 0, which I-will call a shoe. .The bent arm 0' isprovided atits upper extremity-with the weight G which tends to make itslowerend carrying the shoe swing outward -.0r

todischarge and 12; and its action isdiagrammatically toward the tableT. v The shoe 0 is'adapted to press against and slide along. the sidesof the cans which are upon the I on the movement of the table, they passby it. This shoeis of such length approximately as to reach fromthecenter of ohe can to that of the next, and, when all the beams arejfnll,

is prevented by the cans from swinging toward the cans well back intotheir proper positions on the beams it any have not been so placed, If,however, one or more cans are missin from the beams, there is then nohindrance to the movement of the shoe, and impelled by the weight C? itwill move toward the table when such empty beams pass by it.

Mounted upon'the shaft 0 of the feeding device. N, Fig. 12, are theloose pulley c and.

thesliding cl [itch-piece c. The pulley 0 turns freely upon the shaftcwhen notin engagcincnt with the clutch-piece c. The clutchpiece 0 can'slide a limited distance upont-he.

shaft butis made to rotate with itby means .0"? c fixed in theclutch-piece c, to cause the shaft (1 to be driven whenever theclutch-piece is moved toward the pulley c. 'Pivoted upon the frame ofthe feeding device at a is the clutch-arm c, the upper end of which isbifurcated at 'c in order to engage with the clutch-piecev c andisadapted to move the. clutchr-piccealong the shaft 0 as required.

The clutch-arm is bent at its lower end 0 so as to project-between thespokes of the wheel '0' and securely lock it when the clutch' o is outof engagement with the pulley c, in orderthat the feeding device N maynot'be started ICC It also serves incidentally to push v by any possiblesticking of the loose pulley 0 upon its shaftc' The clutch-latch cpivoted at c serves when in engagement with the clutch-arm 0'' (see Fig.10 and dotted lines in Fig. 12) to hold the 'clutclnpiece c inengagement with the pulley c. The clutch-latch c is forced outo'fengagement with the clutcharm 0 (seewholelines, Fig. 12) by the rod 6,which is connected with the guiding-arm C pivoted at (3, and with therod C", the latter being attached at 0* to the arm 0' before described.

In the plan shown in Fig. 2 some of the funnels B B' are left out inorder to better dis close some ofthe parts located underneath them,

Starting with the raceway filled with cans and with such of the beamsB13 as may be necessary, each holding a can, the operation oftheapparatus :is as follows: Upon a discharge of the weighing-machineinto the can which is under the discharge-orifice m the outer end of thecorresponding beam is depressed and its weight raised until the movementis checked by the contact of the inner end of the beam with thecap-piece T This movement of the beam causes, through its drop-piece 13,the disengagement of the latch L from the respective stop-piece L. Thetable '1 is now free to rotate, through the action of the friction-disksD and D and vertical shaft D until the stop-piece corresponding'to thesucceeding beam comes in contact with the latch L, whereupon the tableagain comes to rest, having advanced the distance between two beams andhaving brought another empty can into position under thedischarge-orifice m of the weighingonachine. During this move ment thefollowing operations have taken place: First, by the pressure of the rowof cans in the raceway E a can has been introduced into the empty beamwhich was presented at the foot of the raceway; second, the can justfilled has been brought within striking distance of the rapping deviceRR, &c., where by the charge is soon settled or shaken down in the can,and the beam holding the afore; said can has, by sliding up-the inclinedarrn 0, Fig. 2, beenelevated to the position in relation to the tablewhich it had occupied be-- fore its can was tilled, and the can (shownat :n, Fig. 2) is now ready to be moved upon the apron S; third, the canwhich hadvbeen filled immediately previous to the movement of the tablejustidescribed has been moved off its beamand upon the'apron S throughthe action of the shear-arm K and occupies the position shown at y, Fig.2. At each successive movement of the table T these operations arerepeated, that is, a' can is taken on from the racewayE, an empty onebrought under the weighingmachine, the charge in the one previouslyfilled is shaken down, and the immediate predecessor of the lastmentioned is moved oif its beam and placed upon the apron S. v After acan has been moved upon the supplementary apron S it travels with ituntil itstrikes the shearpicce l, which causes it with a turning andlaterally-sliding motion to move across upon the main apron A, as shownin Fig. By means of the main apron A the can may be transported to anydistance from the weighing apparatus.

In the event that the supply of cans is interrupted, or it one or moreare for some cause missing from their rcspectire beams l3 13, the supplyof material will be shut oil? from the wcighing-machine in the followingmanner: \Vhcn a beam holding no can comes opposite the shoe (3, the bentarm 0 is allowed to swing toward the table (see Figs. El and 11) throughthe action of the weight C, and this increment, acting through the rodsand C, causes the clutch-latch c to be moved out of engagen'ient withthe clutcharm 0 and the latter by its gravity slides the clutch-piece 0out of engagement with the pulley 0'', thereby stopping the feedingdevice, looking the 'wheel c as described, and preventing theweighing-machine thereby from discharging material upon the floor.

By means of the adjustable weights 13"l3' the arms B B may be sobalanced as not to be moved by one discharge of the weighingmachine, butonly upon the second discharge thereof into the same can, or only by thethird discharge, and so On, whereby multiples of the quantity dischargedby the weighing-ma chine may be introduced into one package. By thismeans a machine whose capacity is one pound may be used in putting uppackages of two or three or more pounds.

Myinvention consists, chiefly, of the following: A rotating table havingpivot-ed beams adapted tosupport cans, and having a latch device adaptedtostop the rotation of the table as each successive beam comes intoposition and to be released by such beam upon a discharge of materialfrom a weighing-machine into the corresponding can, and having means forcausing rotation upon the release of the lat-ch device until stopped bythe next successive engagement of the latch; a rotating table havingpivoted beams adapted to support cans, and having a latch device adaptedto be released by it movement of each beam in due order, said movementbeing caused by two or more discharges of material into thecorresponding can, and having means for causing rotation except whenheld by the latch device; a rota ting table having pivoted beams adaptedtosupport cans, and having a latch device adapted to be released by amovement of each of the beams in due order, caused by a discharge ofmaterial into the'corresponding can, and having means forcausingrotation excepting when held by the latch de-- vice,-said tableoperating in connection with an inclined raceway, whereby an empty canis supplied toeach beam as'it is presented empty at the foot of theraceway; a rapping device consisting of rotating hubs withflexible'spokes so located as to strike the filled cans and shake downthe material therein;

a rotating table having pivoted beams adapted tosnpport cans, and havinga latch device adapted to be released by a depressionof one of-the armscaused'by a discharge of material into the corrospondi n g can andhaving in cans "-for causing rotation excepting when held by 'nection.with one main-apron; a suppleme'n tary apron operating in connectionwith a the machine, maybe introduced main apron, the supplementary apronbeing driven, by the under or return side of the main apron, the latterbeing forced against the driving-rollers of the supplementary apron; arotating table for conveying cans to and from a weighing-machine, thetablebeing r"- tated by friction-disks, as described; a novel tighteningdevice fora traveling supplement-ary apron; a rapping device consistingof two hubs havingflex'ible spokes, the hubs rotating in oppositedirections, as described.

I claim-e 1. In a mechanism for filling cans, and adapted to operate inconnection with a weighin g-machine; the combination of the rotatingtable '1, the pivoted can-holding beams B B; said table having a latchdevice adapted to. be released by a movement of one of said beams,

caused by a dischargeof the weighing-machine; and means for causing thetable to rotate upon the disengagement of the said latch, substantiallyas and for the purpose set'forth.

2. In a mechanism for. filling cans, and adapted to operate inconnection with a weighing-machine; the combination of the rotatingtable T, the pivoted can-holding beams 13 B, said beams being soadjusted as to require two or more discharges of the weighing-machineinto their respective cans to move them, a latch device adapted to bereleased by a movement of the beams -in due order, and

meansfor causing the table to rotate upon the disengagement of the latchdevice; whereby multiples of the quantity discharged by into a can,substantially as and for the purpose set forth.

3. In a mechanism for filling cans, and adapted .to operatein'connection with aweighing-machine; thecombination of the rotatingtable '1, the pivoted can-holding beams B B, a latch device vadapted tobe released by av movement of the said beams-in due order,

, means for causing the table to rotate upon the disengagement ofthesaid latch, and the ,in-'

clined race-way E, whereby cans may be successively and automaticallyplaced 'upon the beams and presented under thedischarge-orifice oftheweighing-machine,;substantiail'y as .andfor the purpose set forth.

4. In a' mechanism for filling cans, andadapted to operate in connectionwith a weighing-maohine; the combination of the rotating table T, thepivoted can-holding beams I; B, the shoe 0, said shoe being adapted toperform a movement it one or more of the cans are missing from thetable, the loose pulley e,

. for the purpose set forth.

"5, In-a mechanism for filling cans, and

adapted to operate in connection with a weighing-machine; a rappingdevice, consisting of a rotating hub having flexible spokes, adapted tostrike the filled cans, whereby the charge is shaken down in the can andspilling prevented, and means for conveying cans to and from thedischarge-orifice of said weighing-- machine, substantially as and forthe purpose Set forth.

6. In a mechanism for filling cans and adapted to operatein connectionwith a weighing-machine; the combination of the rotating table '1, thepivoted can-holding beams B B adapted to be depressed at their outerends by holding filled cans, a latch device adapted to be released bythe depression of the said beams 'in due order, the traveling apron S,means for causing the table to rotate upon the disengagement of the saidlatch, and the inclined arm 0, said arm being adapted to raise thedepressed pivoted can-holding beams upon the rotation of the table,substantially as and for the purpose set forth.

7. In a mechanism for filling cans and adapted to operate incon'nectionwith a weiglring-machine; in combination, the rotating table T adaptedto present cans successively to the weighing-machine for filling, themain traveling apron A, the short supplementary traveling apron S,adapted to receive cans from the table T. and deliver them to the saidmain apron A, and means for transferring the cans from the table Tto theapron S, and from the apron S to the apron A, whereby the Came fromseveral weighing-machinesjmay be delivered toone main apron withoutinterfering' with each other, substantially as and for the purpose setforth. r

In .a mechanism for filling cans, and adapted to operate in connectionwith a weighing-machine, the main apron A, the short supplementary apronS adapted to receive filled cans from a weighing apparatus, and meansfor transferring said cans across from the said short'supplementaryapron tothe main apron,

whereby, by using a, short supplementarytoo IOF

apron with each weighing-machine, the cans from severalweighing-machines may be de- Iivered to one main apron withoutinterfering with each other, substantially asandfo'r the purpose setforth.

'9. In a mechanism for filling cans, and adapted to operate inconnection with a weighing-machine in combination, themain'apron A, thesupplementary apron S, the rollers a, a,

10. In a mechanism for lilling cans and adapted to operate in connectionwith a weighing-machine; in combination, the rotating table '1 adaptedto convey cans to and from the -discharge-oriiice of saidweighing-machinc,

said table being provided with a latch device adapted to be released bythe filling of a can presented to saidweighing-machine and when not soreleased to prevent the'rotation of said table, the verticalshatt'D thefriction-disk I) fixed to the Mid shaft, the loose'disk I) resting uponthe said disk D, and means for the continuous rotation of the said disk1), whereby tlie filling of a can presented to the weighingnnachi'neallows the table to rotate and an empty can to be presented,substantially as and for the purpose set forth.

- 11. In a'mechanisin for filling cans and adapted to operate inconnection with a weigh: in gmaeliiue'; in combination, the rotatingtable '1, the" pivoted can-holding beams B B, thefunnels B B saidfunnels being mounted upon said beams by suitable mechanism and adaptedto transmit material into cans placed beneath them upon said beams, saidtable being provided withfa latch device adapted to be disengagedwhenever a can presented by said table to the'weighing-machine has beenfilled, and means for rotating said table upon the disengagement of saidlatch device, substantially as and for the purpose set forth.

12. In a mechanism for filling cans and adapted to operate in connectionwith a weighing-machine; in combination, the apron S, the rollers s 8adapted to support and drive the said apron one at each endsubstantially as described, the rollers s s mounted in the frame :5 andbearing upon the under or return part of the apron Sand in opposition tothe roller (6 the rollerafi, the frame .5 adapted to adj ust-abl ysupport the rollers s s, the pivoted arm 5 adapted to carry the frame 5*in opposition to the weight 5, and the weight 5, whereby tension ismaintained on the said apron S, substantially as and for the purpose setforth 13. In a mechanism for filling cans and adapted to operate inconnection with a weigh lug-machine; in combination, the rotating hub Rhaving the flexible spokes R R, the spindle 7" adapted to support thehubR, and

the pulley r fixed upon and adapted to drive the said spindle 1' withthe hub It having the'flexible spokes R" It, and mounted upon the loosesleeve 1- the sleeve 1' rotating upon the spindle 1', the pulley 'rfixed upon the sleeve 9" and a suitable supporting-frame,

whereby the said hubs R and R" may be rotated in directions opposite toeach other, sul stantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in thepresence oi. two subscribing witnesses, on this 15th day of April, A.l). n90.

WILLIAM EMERY XICKERSON. Wit-n esses:

FRANK G, PARKEk, WILLIAM H. PARRY.

